<!DOCTYPE html>
<title>window.requestIdleCallback exists</title>
<link rel="author" title="Ross McIlroy" href="mailto:rmcilroy@chromium.org" />
<link rel="help" href="http://www.w3.org/TR/requestidlecallback/"/>
<script src="../../../../resources/testharness.js"></script>
<script src="../../../../resources/testharnessreport.js"></script>
<link rel="stylesheet" href="../../resources/testharness.css" />
<script>
test(function() {
  assert_equals(typeof window.requestIdleCallback, "function");
}, "window.requestIdleCallback is defined", {assert: "The window.requestIdleCallback function is used to request callbacks during browser-defined idle time."});

test(function() {
  assert_equals(typeof window.cancelIdleCallback, "function");
}, "window.cancelIdleCallback is defined", {assert: "The window.cancelIdleCallback function is used to cancel callbacks scheduled via requestIdleCallback."});

test(function() {
  assert_equals(typeof window.requestIdleCallback(function() {}), "number");
}, "window.requestIdleCallback() returns a number", {assert: "The requestIdleCallback method MUST return a long"});

test(function() {
  assert_equals(typeof window.cancelIdleCallback(1), "undefined");
}, "window.cancelIdleCallback() returns undefined", {assert: "The cancelIdleCallback method MUST return void"});

test(function() {
  assert_equals(typeof window.cancelIdleCallback(-1), "undefined");
  assert_equals(typeof window.cancelIdleCallback(0), "undefined");
}, "window.cancelIdleCallback() returns undefined for unmapped IDs", {assert: "The cancelIdleCallback method MUST return void"});

async_test(function() {
  // Check whether requestIdleCallback schedules a callback which gets executed
  // and the deadline argument is passed correctly.
  requestIdleCallback(this.step_func(function(deadline) {
    assert_equals(typeof deadline, "object", "IdleDeadline MUST be passed to callback.");
    assert_equals(typeof deadline.timeRemaining, "function", "IdleDeadline.timeRemaining MUST be a function which returns the time remaining in milliseconds");
    assert_equals(typeof deadline.timeRemaining(), "number", "IdleDeadline.timeRemaining MUST return a double of the time remaining in milliseconds");
    assert_true(deadline.timeRemaining() <= 50, "IdleDeadline.timeRemaining() MUST be less than or equal to 50ms in the future.");
    assert_equals(typeof deadline.didTimeout, "boolean", "IdleDeadline.didTimeout MUST be a boolean");
    assert_false(deadline.didTimeout, "IdleDeadline.didTimeout MUST be false if requestIdleCallback wasn't scheduled due to a timeout");
    this.done();
  }));
}, 'requestIdleCallback schedules callbacks');

async_test(function() {
  // Check whether requestIdleCallback schedules a callback which gets executed
  // and the deadline argument is passed correctly.
  var handle = requestIdleCallback(this.step_func(function(deadline) {
    assert_unreached("callback should not be called if canceled with cancelIdleCallback");
  }));
  cancelIdleCallback(handle);
  setTimeout(this.step_func(function() {
    this.done();
  }), 200);
}, 'cancelIdleCallback cancels callbacks');

</script>
<h1>Description</h1>
<p>This test validates that window.requestIdleCallback and window.cancelIdleCallback exist and are a functions.</p>
<div id="log"></div>
